Question 1

Which of the following best describes the role of the hypothalamus in hormone regulation?

Accepted Answer

It stimulates the pituitary gland to release hormones that regulate other endocrine glands.

Question 2

A patient presents with high blood glucose levels. Which hormone is most likely deficient, and what is its primary action?

Accepted Answer

Insulin; promotes glucose uptake by cells

Question 3

Which of the following is a correct sequence of events in the hypothalamic-pituitary-adrenal (HPA) axis during a stress response?

Accepted Answer

Hypothalamus releases CRH → Pituitary releases ACTH → Adrenal cortex releases cortisol

Question 4

A patient with Addison’s disease is likely to have which of the following hormonal imbalances?

Accepted Answer

Deficient cortisol and aldosterone

Question 5

Which hormone is released in response to low blood calcium levels, and what is its effect?

Accepted Answer

Parathyroid hormone (PTH); stimulates bone resorption to increase blood calcium

Question 6

Which of the following best explains the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones directly into the bloodstream; exocrine glands secrete substances into ducts.

Question 7

A patient is experiencing symptoms of hyperthyroidism. Which laboratory finding would you expect?

Accepted Answer

Increased levels of thyroxine ($$T_4) $$and triiodothyronine ($$T_3)$$

Question 8

Which of the following is a direct effect of antidiuretic hormone (ADH) on the kidneys?

Accepted Answer

Promotes water reabsorption in the collecting ducts

Question 9

Which hormone is primarily responsible for stimulating red blood cell production, and where is it produced?

Accepted Answer

Erythropoietin; produced by the kidneys

Question 10

A patient with diabetes insipidus is most likely to have a deficiency of which hormone, and what is the expected symptom?

Accepted Answer

Antidiuretic hormone (ADH); excessive urination

Question 11

Which of the following equations correctly represents cardiac output ($$CO$$)?

Accepted Answer

$$CO = HR 	imes SV$$

Question 12

A patient has a stroke volume ($$SV) of 70 mL $$and a heart rate ($$HR) of 80 $$beats per minute. What is the cardiac output ($$CO$$)?

Accepted Answer

$$CO = 5600 	ext{ mL/min}$$

Question 13

Which of the following best describes the Frank-Starling law of the heart?

Accepted Answer

The greater the stretch of cardiac muscle fibers, the stronger the contraction.

Question 14

Which of the following is a correct pathway of blood through the heart starting from the right atrium?

Accepted Answer

Right atrium → Right ventricle → Pulmonary artery → Lungs → Left atrium → Left ventricle → Aorta

Question 15

Which of the following is a major function of platelets in the blood?

Accepted Answer

Initiate blood clotting

Question 16

A patient with anemia is likely to have which of the following laboratory findings?

Accepted Answer

Decreased hematocrit and red blood cell count

Question 17

Which of the following best explains the role of the SA node in cardiac physiology?

Accepted Answer

It initiates the electrical impulse that sets the pace for the heart rate.

Question 18

Which of the following is a correct description of the QRS complex in an electrocardiogram (ECG)?

Accepted Answer

It represents ventricular depolarization.

Question 19

Which of the following is a direct effect of increased sympathetic stimulation on the heart?

Accepted Answer

Increased heart rate and contractility

Question 20

Which of the following equations correctly represents the relationship between stroke volume ($$SV$$), end-diastolic volume ($$EDV$$), and end-systolic volume ($$ESV$$)?

Accepted Answer

$$SV = EDV - ESV$$

Comprehensive Study Notes: Endocrine System, Blood, and Cardiovascular System (Heart)

Study Guide - Practice Questions

Study Guide - Flashcards